AMC-20-15.pdf
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1、 AMC 20-15 AMC 20-15 Effective: 30/03/2011 Annex II to ED Decision 2011/001/R of 23/03/2011 AMC 20-15: Airworthiness Certification Considerations for the Airborne Collision Avoidance System (ACAS II) with optional Hybrid Surveillance 1 PREAMBLE This Acceptable Means of Compliance (AMC) provides a me
2、ans that can be used to obtain an airworthiness approval for the installation of ACAS II equipment which may include optional hybrid surveillance. It is issued to support the operational requirement that requires the carriage of ACAS II. Hybrid Surveillance is an optional feature that allows ACAS II
3、 to use a combination of active surveillance, i.e. actively interrogating the Mode-S Transponders of surrounding aircraft, and passive surveillance, i.e. use of ADS-B position and altitude data (extended squitter), to update an ACAS II track. An applicant may elect to use an alternative means of com
4、pliance. However, those alternative means of compliance must meet the relevant requirements and ensure a safety objectives as defined in paragraph 5 are met. Compliance with this AMC is not mandatory. 2 RELEVANT REQUIREMENTS The provisions to which this AMC applies are: CS 25.1301, 1302, 1309, 1322,
5、 1333, 1431, 1459, 1529 and 1581. CS 23.1301, 1309, 1322, 1431, 1459, 1529 and 1581. CS 27.1301, 1309, 1322, 1459, 1529 and 1581 CS 29.1301, 1309, 1322, 1333, 1431, 1459, 1529 and 1581 3 REFERENCE MATERIAL EU OPS1 1.160, 1.668, 1.1045, 1.398 AMC 25.1302, AMC 25.1309, AMC 25.1322 and AMC 25-11. ETSO-
6、C113 Airborne Multipurpose Electronic Displays ETSO-C119c Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment, TCAS II. ETSO-2C112() Air Traffic Control Radar Beacon System/Mode Select (ATCRBS/Mode S) Airborne Equipment EUROCAE ED-143 including change 1 Minimum Operational Perform
7、ance Standards for Traffic Alert and Collision Avoidance Systems (TCAS) Airborne Equipment. 1 Council Regulation (EEC) No 3922/91 on the harmonisation of technical requirements and administrative procedures in the field of civil aviation. Regulation as last amended by Regulation (EC) No 1899/2006 of
8、 the European Parliament and of the Council of 12 December 2006 (OJ L 377, 27.12.2006, p. 1). Page 1 of 9 AMC 20-15 EUROCAE ED-112 Minimum Operational Performance Specification for Crash Protected Airborne Recorder Systems RTCA DO-300 including change 1 Minimum Operational Performance Standards (MOP
9、S) for Traffic Alert and Collision Avoidance System II (TCAS II) Hybrid surveillance. 4 MINIMUM EQUIPMENT QUALIFICATION 4.1 An acceptable minimum certification standard for the ACAS II equipment including optional hybrid surveillance is EASA ETSO-C119c. 4.2 An acceptable minimum certification standa
10、rd for the associated Mode S transponder is EASA ETSO-2C112(). 5 SAFETY OBJECTIVES The applicant should perform a Functional Hazard Assessment (FHA) and System Safety Assessment (SSA) for the proposed ACAS II installation. For the purposes of this AMC, a system includes all airborne devices contribu
11、ting to the ACAS II function. Guidance is provided in AMC 25.1309 or FAA AC 23-1309-1() or AC 27- 1B or AC 29-2C. Acceptable probability levels for functionality and alerts are given below: 5.1 The probability of failure of the installed system to perform its intended function from a reliability and
12、 availability perspective should be shown to be no greater than 110-3 per flight hour. 5.2 The probability of failure of the system to provide the required RA aural or visual alert, when required, without a failure indication should be shown to be no greater than 110-4 per flight hour in the termina
13、l environment and 110-5 per flight hour in the en-route environment. See note 1. 5.3 The probability of a false or misleading RA aural and visual alert due to a failure of the system should be shown to be no greater than 110-4 per flight hour in the terminal environment and 110-5 per flight hour in
14、the en-route environment. See note 1. Note: The definition of a misleading alert is when an RA condition exists, and an RA is issued, but the RA gives incorrect guidance. The definition of a false alert is when an RA is issued, but an RA condition does not exist. 5.4 Failure of the installed ACAS II
15、 must not degrade the integrity of any essential or critical system which has an interface with the ACAS II. The use of Hybrid Surveillance including transitions from active to passive surveillance and vice versa, using a system that complies with the requirements of RTCA DO-300 including Change 1,
16、is assumed not to compromise the safety of ACAS II. Note 1: In terminal airspace the frequency of encounters, where another aircraft could be present, may be assumed to be once every 10 hours. In en- route airspace the frequency of encounters, where another aircraft could be present, may be assumed
17、to be once every 200 hours. Different frequencies may be used if supported by operational data. Page 2 of 9 AMC 20-15 6 HARDWARE AND INSTALLATION 6.1 General Considerations: The installation should include as a minimum a single ACAS II system and a single Mode S Transponder that meet the requirement
18、s of paragraph 4. 6.2 Aural Alerts: (a) TA and RA aural alerts should be presented by the prescribed voice announcements via flight deck loudspeakers. (b) Consideration should be given to presenting ACAS II voice announcements via headsets at a preset level. (c) A means for the pilot to cancel activ
19、e voice announcements and visual indicators is permitted but should not be necessary where voice announcements have a specific duration. (d) The ACAS II voice announcements should be consistent with the general philosophy of other flight deck aural alerting systems. In particular, the prioritisation
20、 and compatibility of alerts and voice announcements from different warning systems should be consistent with each other. The alert priorities should be wind shear, TAWS and then ACAS II. Altitude callout advisories which occur simultaneously with ACAS II advisories are permitted, but the audibility
21、 of each voice alert will need to be understandable. (e) The adequacy of aural levels will need to be demonstrated. Note: For rotorcraft, TA and RA aural alerts should be presented via headsets at a preset level 6.3 Displays (b) bearing accuracy check of intruder. A maximum error of 15 degrees in az
22、imuth should be demonstrated for each quadrant. Larger errors may be acceptable in the tail area of the aircraft; (c) failure of sensors which are interfaced to ACAS II. A test should be performed to ensure that the effect on ACAS II agrees with the predicted results; (d) correct warning prioritisat
23、ion. The alert priorities should be wind shear, TAWS and then ACAS II; (e) electromagnetic interference evaluation to ensure that ACAS II does not cause interference with other aircraft systems; (f) the correct operation of any aircraft configurations which result in, by design, the inhibition of RA
24、s. 7.3 Flight testing of an initial installation should evaluate overall operation including: (a) surveillance range; Note: Surveillance range may vary depending on airspace conditions. (b) target azimuth reasonableness. (c) freedom from unwanted interference; (d) assessment, during adverse flight c
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